Question

The radius of circle A is 9 times greater than the radius of circle B. Which of the following statements is true?
A. The area of circle B is 9 times greater than the area of circle A.
B. The area of circle A is 9 times greater than the area of circle B.
C. The area of circle B is 81 times greater than the area of circle A.
D. The area of circle A is 81 times greater than the area of circle B.

Answer 1

The area of circle A is 81 times greater than the area of circle B.

Since the formula is a = pi * r^2 the radius is being squared and the radius of circle a is 9 times grater it will be squared to 81 making the area 81 times bigger.

So D is your answer.

:)))